Compare Viagra vs. Cialis

Head-to-head comparisons of medication uses, side effects, ratings, and more.

Viagra
(Sildenafil)

Cialis
(Tadalafil)

Helps you get aroused. Viagra (Sildenafil) is a first-choice treatment for erectile dysfunction. However, you need to take it at least 30 minutes before having sex, so the lack of spontaneity may not work for some people.Helps you get aroused. Cialis (Tadalafil) is the only medication in its class that treats both erectile dysfunction and enlarged prostate symptoms. You can also take it on a regular basis, which can allow for more spontaneity, but it can be expensive.
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Reviews & ratings
Button Group. All currently active
Button Group. All currently active
5.121140142517815Viagra
Reviews for Viagra (Sildenafil)
67%
of people say Viagra (Sildenafil) is worth it
51%
say it works well
16%
say it's a big hassle
Reviews for Cialis (Tadalafil)
66%
1% vs. Viagra (Sildenafil)
46%
5% vs. Viagra (Sildenafil)
14%
+2% vs. Viagra (Sildenafil)
Side effects
ViagraCialis
  • Headache 12%
  • Flushing 9%
  • Nasal congestion 2%
  • Diarrhea 2%
  • Dizziness 1%
  • Rash 1%
  • Urinary tract infection 1%
More Viagra side effects »
  • Headache 10%
  • Indigestion 9%
  • "stomach flu" 3%
  • Back pain 3%
  • Muscle pain 3%
  • Flushinga 2%
  • Flushing 2%
  • Pain in limb 2%
  • Common cold 1%
More Cialis side effects »
How it works
ViagraCialis
Viagra (Sildenafil) is a PDE-5 inhibitor. Blocking PDE-5 allows blood to enter the penis and helps create an erection.Cialis (Tadalafil) is a PDE-5 inhibitor. Blocking PDE-5 allows blood to enter the penis and helps create an erection. Cialis (Tadalafil) also treats enlarged prostate symptoms.
Type of medication
ViagraCialis
Phosphodiesterase-5 enzyme inhibitorPrescription only
Phosphodiesterase-5 enzyme inhibitorPrescription only
Available as
ViagraCialis
  • Pill
  • Pill
Used for (click to learn more)
ViagraCialis
Risk factors for serious side effects
ViagraCialis
  • Having a heart attack, stroke, or rhythm problem in your heart in the last 6 months
  • Having low or high blood pressure
  • Heart failure or coronary artery disease causing unstable angina (chest pain)
    • Men over 50 years of age
      • Taking alpha blockers
      • Taking medications for high blood pressure
      Detailed Viagra (Sildenafil) risks & warnings »
          • Men over 50 years of age
            Detailed Cialis (Tadalafil) risks & warnings »
            Pregnancy category
            ViagraCialis
            BFDA pregnancy category (Probably safe)

            Research studies with animals haven’t found a risk to unborn babies, but it hasn’t been properly studied in humans.

            See the FDA package insert
            BFDA pregnancy category (Probably safe)

            Research studies with animals haven’t found a risk to unborn babies, but it hasn’t been properly studied in humans.

            See the FDA package insert
            Alcohol
            No specific alcohol-related info.
            • Don't drink a lot of alcohol when you're taking this medication since it can make dizziness worse.
            Food
            • Taking it after eating a high-fat meal can delay or reduce its effects.
            • Works best when taken on an empty stomach. Fatty foods can prevent Viagra (Sildenafil) from working as well.
            • Can be taken with or without food.
            • Can be taken with or without food.
            Kidneys and liver
            No specific kidneys and liver-related info.No specific kidneys and liver-related info.
            Sex
            • You need to take it at least 30 minutes before sex.
            • It's best to take Viagra (Sildenafil) about 1 hour before sexual activity, but you can take it anywhere between 4 hours and 30 minutes before you need it.
            • If you have an erection for more than 4 hours, go to the ER or call your doctor.
            • There have been reports of men having an erection lasting more than 4 hours while on Viagra (Sildenafil). This has been rare. If not treated in time, this can cause permanent damage to your penis, including impotence. Talk to your doctor immediately or go to the emergency room if this happens.
            • Can be taken either as needed, or on a regular basis (which allows you to be more spontaneous before sex).
            • If you have an erection for more than 4 hours, go to the ER or call your doctor.
            • There have been reports of men having an erection lasting more than 4 hours while on Cialis (Tadalafil). This has been rare. If not treated in time, this can cause permanent damage to your penis, including impotence. Talk to your doctor immediately or go to the emergency room if this happens.
            Sleep
            No specific sleep-related info.No specific sleep-related info.
            Weight
            No specific weight-related info.No specific weight-related info.
            Upsides and benefits
            ViagraCialis
            • It can be taken just when you need it.
            • First-choice medication for treating erectile dysfunction.
            • It's the only one in its class to also treat enlarged prostate symptoms.
            • Can be taken either as needed, or on a regular basis (which allows you to be more spontaneous before sex).
            • Can be taken with or without food.
            • Lasts longer than Viagra.
            • First-choice medication for treating erectile dysfunction.
            Downsides and risks
            ViagraCialis
            • You need to take it at least 30 minutes before sex.
            • Taking it after eating a high-fat meal can delay or reduce its effects.
            • Can't be taken if you've had a heart attack in the past 3 months, or stroke or heart failure in the past 6 months.
            • Side effects can be more pronounced if you're over age 65.
            • Can cause flushing, headache, and dizziness, or sudden hearing and vision changes.
            • Can't use if you've recently taken nitrates like Isordil, Imdur, or nitroglycerin (Nitro-BID, Nitro-Dur, Nitrostat).
            • Only available as brand name, so it can be expensive.
            • Can't be taken if you've had a heart attack in the past 3 months, or stroke or heart failure in the past 6 months.
            • Side effects can be more pronounced if you're over age 65.
            • Can cause flushing, headache, and dizziness, or sudden hearing and vision changes.
            • Can't use if you've recently taken nitrates like Isordil, Imdur, or nitroglycerin (Nitro-BID, Nitro-Dur, Nitrostat).
            Tips from our pharmacists for people taking the medication
            ViagraCialis
            • It's best to take Viagra (Sildenafil) about 1 hour before sexual activity, but you can take it anywhere between 4 hours and 30 minutes before you need it.
            • Don't take it more than once a day.
            • Can cause flushing, a headache, or dizziness.
            • Works best when taken on an empty stomach. Fatty foods can prevent Viagra (Sildenafil) from working as well.
            • If you have an erection for more than 4 hours, go to the ER or call your doctor.
            • Comes in two differents doses: one that's taken on a regular basis and the other only when you need it.
            • If you're taking Cialis (Tadalafil) on a regular basis, take it at the same time every day.
            • Don't take [name_ommon] more than once a day.
            • Can be taken with or without food.
            • Don't drink a lot of alcohol when you're taking this medication since it can make dizziness worse.
            • Can cause flushing, headache, and dizziness.
            • If you have an erection for more than 4 hours, go to the ER or call your doctor.
            Learn more
            More about ViagraSide effectsReviews & ratingsAlternativesFDA package insert
            More about CialisSide effectsReviews & ratingsAlternativesFDA package insert